Kit Up! at Miliary.com notes the Gerber Yari II Knife.

In addition to being impressed with the quality of the knife’s construction, I was also quite impressed with the quality and construction of the sheath as well as the "attachment” options that come with the knife. In addition to the now standard MOLLE attachment straps, the sheath also comes with a belt loop, as well as a screw-in clip for attaching the knife to a molded plastic drop leg pistol holster such as the Safariland Model 6004. While the knife is held securely in the sheath by a pair of “grippers” molded into the sheath (which is how I currently have it configured) an optional thumb release strap is included with the knife for additional retention piece of mind.

Good discussion in the comments section, both pro and con. Also, this one:

I've carried my KBAR since the War of 1812 and there is no better knife. All other knives are not worthy of the name knife.

When James W. KBAR invented the Knife, it was a KBAR.

---Sorry, I just thought I would get that out of the way...

Funny!